A discount of 20% is given for the purchase of two books by a bookseller and a discount of 25% is offered if a customer buys more than two books. A 10% discount is being offered to all the customers on purchase of one book. An additional 5% discount will be given to students. Sohan, a student of M.Com. in college, bought a book for Rs.513. What was the marked price of the book?

Rs.600

We know that,

SP = MP × (100 - Disocunt%)

We have,

Cost price of book = Rs. 513

Now, According to the question,

= MP × (100 - 5%) × (100 - 10%) = 513

= MP × 95% × 90% = 513

= MP = 513 × 100/90 × 100/95

= MP = 600